What games have you purchased at full price just to support the developer? For me, Resident Evil games in recent times - don't want to see the franchise go so try to support at full value. Otherwise, all other titles are mainly on the cheap.
I buy all my games from the Nintendo eShop, so I play full price all the time.
The only time I bought a physical game this year was Mario Kart 8 Deluxe in Tokyo, which I bought tax free (and therefore paid almost 1000 yen less than I was supposed to).
The only issue when buying tax free is that it takes a very long time before you can even leave the store.
Any games I truly feel that is worth it, such as my recent purchase of .hack//G.U Last Recode. I should have also bought Persona 5 on launch day but I am trying to budget myself of late.